Dark but also at times sweet and moving story about a man who turns into a werewolf at night and runs through the streets of Paris. A common plot in the horror genre now but this is an early telling. Endore humanizes the man and shows that he doesn't really enjoy what he is but what is he to do? The change will happen whether he likes it or not. Movies such as "Wolf" with Jack Nicholson and more recently "The Wolfman" with Benicio del Toro and Anthony Hopkins have popularized the theme, but this book is worth reading simply for experiencing Endore's talents as a writer.
I love Endore's writing style - it's a shame his books are nearly impossible to find in print anymore. I've been lucky enough to find a vintage edition here and there over the years. With this story, it's creepy enough for horror/thriller fans but there's also an interesting spin with the werewolf having a really human, remorseful element to his nature.